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The title translates as Unfaithful Eckehart, and indeed Dr. Eckart Bleitreu (Ralph A. Roberts) is cheating on his loving wife (Luize Englisch). To throw his wife off his scent, Bleitreu claims that it's his brother-in-law Fritz (Fritz Schulz) who is the philanderer. The doctor's deception backfires when, thanks to his presumed prowess with the ladies, Fritz ends up with a cushy government job and a huge salary. Befitting its subject manner, Ungetrue Eckehart has plenty of old-fashioned door-slamming and ducking in and out of boudoirs. Reportedly, the film was also produced in a French-language version.